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CN102077008A - Method for controlling a compressed air unit and compressed air unit for applying such a method - Google Patents

Method for controlling a compressed air unit and compressed air unit for applying such a method Download PDF

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Publication number
CN102077008A
CN102077008A CN2009801250143A CN200980125014A CN102077008A CN 102077008 A CN102077008 A CN 102077008A CN 2009801250143 A CN2009801250143 A CN 2009801250143A CN 200980125014 A CN200980125014 A CN 200980125014A CN 102077008 A CN102077008 A CN 102077008A
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China
Prior art keywords
expulsion valve
feeding side
air unit
pressurized air
expulsion
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CN2009801250143A
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CN102077008B (en
Inventor
K·范坎普福特
O·M-A·贝耶尔特
P·J·海尔曼
S·J·R·J·扬森斯
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Atlas Copco Airpower NV
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Atlas Copco Airpower NV
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D9/00Level control, e.g. controlling quantity of material stored in vessel
    • G05D9/12Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16TSTEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
    • F16T1/00Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Drying Of Gases (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Fluid Pressure (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

Method for controlling a compressed air unit which is provided with at least one controllable drain valve (8, 27, 37 or 39), characterised in that this method comprises the step of controlling the above-mentioned drain valve (8, 27, 37 or 39), at least on the basis of a system parameter which is not a system parameter on the feed side of said drain valve (8, 27, 37 or 39).

Description

A kind of pressurized air unit of controlling the method for pressurized air unit and using this method
Technical field
The present invention relates to a kind of be used to the control method of pressurized air unit (such as compressor unit, dryer unit or similar devices) and the pressurized air unit of using this method.
Background technique
At US 6,588, a kind of method that is used to control the pressurized air unit is disclosed among the 443B2, a kind of method that is used for discharging from the multistage compressor unit condensation product is specifically disclosed, thus, the condensation product that is formed in the cooler of each corresponding pressure level is discharged via the special-purpose waste pipe that is located at described pressure level downstream.
According to US 6,588, the shortcoming of this method of 443B2 is to need a lot of valves, and owing to have a plurality of valves and link, and the volume of equipment of therefore using this method is bigger.Another shortcoming of this method is that except the discharging condensation product, it can not be used to carry out other function.
At EP 0,391, a kind of equipment is disclosed among the 250A2, it can be used to condensation product in trap discharging condensation product when reaching default maximum height, until reaching another setting height.
The shortcoming of this structure is not consider other measurement signal, this structure only be suitable for from the condensate drain in some traps in open storage, and it can not be used to carry out other function.
US 6,191, and 253B1 has described a kind of expulsion valve, and it is used for discharging immediately condensation product when condensation product appears at the inlet of described expulsion valve.Yet, the shortcoming of this valve mechanism be it can only be used to from the condensate drain of single storage in open storage.Another shortcoming is that volume is big inadequately, and this means needs a plurality of work cycle when a large amount of condensation product of discharging.
Summary of the invention
The present invention aims to provide a kind of method that is used to control the pressurized air unit, compares with existing method, and this method all improves to some extent aspect different a lot.
For this reason, the present invention relates to a kind of method that is used to control the pressurized air unit that is provided with at least one controlled expulsion valve, it is characterized in that this method comprises the step of controlling above-mentioned expulsion valve at least based on the coefficient parameter of the systematic parameter on the feeding side of non-described expulsion valve.
" the feeding side of expulsion valve " refers to the inlet side of this valve, in other words is that side that is positioned at described expulsion valve upstream.
In this case, " expulsion valve " refers to such valve, and it can be used to discharge condensation product, but also do not get rid of this valve is not used for other function.
The advantage of the method according to this invention is: owing to only need a limited number of valves, therefore allow to realize simple and compact structure.
Therefore, the said system parameter comprises the measurable physical parameter that appears in the pressurized air unit, such as temperature value, force value, liquid level or similar parameters, and the perhaps internal state signal that generates based on measurable physical parameter.
This " internal state signal " refers to signal that calculates or the signal of determining by the physical parameters measurement value in controller.The example of this application is to realize control by the counter that the reading based on specific measurable physical parameter begins.
The advantage of the method according to this invention is: it allows to carry out by expulsion valve is the specific function that realizes by each separate part (such as expulsion valve or like) up to now, and making no longer needs these specific features.
Therefore for example, when the pressure in detecting interstage cooler surpassed certain limit and its and is detected, the pressure of interstage cooler will be bled off by the controlled expulsion valve that is located on the interstage cooler.
According to characteristic of the present invention, this method is further comprising the steps of: mensuration is as the pressure on the feeding side of at least two expulsion valves of the part of pressurized air unit, and control these different expulsion valves, make these two expulsion valves that are positioned on the feeding side can not be opened simultaneously with different pressures value.
The advantage of this ad hoc approach is: it avoids two expulsion valves to be opened simultaneously, thereby prevents that condensation product from flowing to the lower another part of pressure from the part of pressurized air unit.
According to another characteristic of the present invention, this method comprises two the different expulsion valves of control as the part of pressurized air unit, makes the step that they can not be opened forever simultaneously.
For example, this can and judge based on it whether expulsion valve is opened and realize by the liquid level on the feeding side of measuring described corresponding expulsion valve.
The invention still further relates to a kind of pressurized air unit that makes it possible to use said method, according to characteristic of the present invention, described pressurized air unit is provided with at least one expulsion valve that is connected to controller with controlled manner, therefore above-mentioned controller is also connected to the systematic parameter of detection device with the systematic parameter on the feeding side of determining at least one non-described expulsion valve, and therefore above-mentioned controller comprises the algorithm based on the measured load control expulsion valve of described systematic parameter.
In order to explain characteristic of the present invention better, in the mode of property for example and not limitation the method for optimizing that is used to control the pressurized air unit according to the present invention is described below, and is described with reference to unique accompanying drawing correspondence pressurized air unit in this way.
Description of drawings
Fig. 1 has described pressurized air unit 1, and in this example, described pressurized air unit 1 is provided with two stage compressor, and it has the low pressure stage 2 that links to each other with suction line 3 and link to each other with high pressure stage 4 at its outlet side.
Embodiment
Between pressure level 2 and 4, be provided with the interstage cooler 5 and first liquor separator 6, on first liquor separator 6, be connected with first waste pipe 7 that wherein is provided with first expulsion valve 8.
In the compressed-air line 9 of high pressure stage 4, be provided with safety check 10, flowing of high pressure stage 4 in its permission compressed-air line 9, and prevent that when this two stage compressor is closed pressurized gas is back to suction line 3 from still being under the pressure with the parts that are positioned at described two stage compressor downstream.
In this example, pressurized air unit 1 also comprises and is used for the gas from two stage compressor is carried out dry drying equipment, described drying equipment mainly is included in BE 1,005, the sort of exsiccator of describing in 64 11, it is formed by the pressurized container 12 with arid region 13 and renewing zone 14 and rotor 15, and described rotor 15 is made of cylindrical dry element 16, is provided with absorption and/or the absorbing medium that alternately is conducted through arid region 13 and renewing zone 14 in described dry element 16.
In addition, exsiccator 11 comprises main pipe 17, and described main pipe 17 connects compressed-air line 9 and exsiccator 11 is linked to each other with the outlet of high pressure stage 4, and opens wide in mixing apparatus 18, and the outlet of mixing apparatus 18 is connected to the inlet of above-mentioned arid region 13.
Export pipeline 19 makes the outlet of arid region 13 link to each other with Consumer's network 20, and wherein export pipeline 19 and Consumer's network 20 separate by safety check 21.
The side pipeline makes compressed-air line 9 link to each other with the inlet of renewing zone 14.
Renewing zone 14 is made of the part with rotor 15, and it is sealed by screen 23 on two axial side.The remaining part of rotor 6 constitutes arid region.
In this example, above-mentioned main pipe 17 is provided with aftercooler 24 and is located at second liquor separator 25 in described aftercooler 24 downstreams, and described second liquor separator 25 is furnished with second waste pipe 26, is provided with second expulsion valve 27 in described second waste pipe 26.
Mixing apparatus 18 comprises sparger, and well-known, sparger comprises injection pipe 28 and mixing tube 29, is provided with suction inlet 30 between injection pipe 28 and the mixing tube 29.Mixing tube 29 ends at the ingress of arid region 13.
In this example, in known manner with the live axle of mixing apparatus 18 as rotor 15, for this reason, mixing tube 29 is connected to motor (it is not shown in figures) by means of the axle that is connected with mixing tube 29 by link.
The export pipeline 19 of above-mentioned exsiccator 11 can be connected to main pipe 17 by branch road 31 by convention, and in this example, described branch road 31 comprises cut-off valve 32 just as main pipe 17, export pipeline 19 and side pipeline 22.
The outlet of renewing zone 14 is connected to inner space 34 in the pressurized container 12 via cooling tube 33, and described inner space 34 links to each other with above-mentioned suction port 30.
Be provided with regeneration cooler 35 in the cooling tube 33, its for example (but not necessarily) be air cooled, but have the shape of heat exchanger on its principle.
On pressurized container 12, be connected with the 3rd waste pipe 36, in this example, be provided with the 3rd expulsion valve 37 in described the 3rd waste pipe 36.
In this example, on the inlet of arid region 13, also be connected with the 4th waste pipe 38, in described the 3rd waste pipe 38, also be provided with the 4th expulsion valve 39.
In this example, above-mentioned each waste pipe 7,26,36 and 38 is connected to single public storage 40 (but this not necessarily).Yet,, several storages also can be provided and/or use the open type storage according to the present invention.
Pressurized air unit 1 also comprises controller 41, expulsion valve 8,27,37 and 39 is connected to controller 41 with controllable mode, and also be connected with detection device on the controller 41 to measure the systematic parameter of the systematic parameter on the non-feeding side that is positioned at relevant controlled expulsion valve at least, and measure several systematic parameters in this example, the system pressure on promptly corresponding expulsion valve 8,27,37 and 39 the feeding side and the measured value of liquid level.
For this reason, above-mentioned detection device comprises four pressure transducer 42-45, and they are located at respectively on the feeding side of above-mentioned expulsion valve 8,27,37 and 39.
In this example, first pressure transducer 42 is located in the interstage cooler 5, second pressure transducer 43 is located in the aftercooler 24, the pressure in the 3rd pressure transducer 44 measurement spaces 34, and the 4th pressure transducer 45 is assembled into the pressure of the ingress that can measure arid region 13.
In addition, in this example, detection device comprises two liquid level sensors 46 and 47 that are located in the corresponding liquid separator 6,25, and be located at two liquid level sensors 48 and 49 in the exsiccator 11 in the feeding side of expulsion valve 37,39 respectively, so among these liquid level sensors 46-49 each also links to each other with above-mentioned controller 41.
The invention is not restricted to use pressure illustrated in the accompanying drawings and liquid level sensor; On the contrary, also can adopt other structure.Therefore, for example can omit one or several liquid level sensors.
Work according to the pressurized air unit 1 of application of the present invention is very simple, and specific as follows:
When this two stage compressor is activated, gas (for example air) sucks via suction line 3, described gas at first is compressed by low pressure stage 2, and then pressurized arrives high pressure stage 4 further to be compressed there by the interstage cooler 5 and first liquor separator 6.
Because the combination that the pressure of pressurized gas raises and then temperature descends in interstage cooler 5, condensation (this is known) can take place in the water vapour in the air-flow, therefore form drop in air-flow, these drops are separated from air-flow in first liquor separator 6.
Be close to the 100% saturated pressurized gas that is arranged in first liquor separator, 6 downstreams, its be subjected to high pressure stage 4 compression and by aftercooler 24 after will form condensation product once more and drip, these drops will be removed from air-flow in second liquor separator 25.
The saturated pressurized gas that leaves second liquor separator 25 flows into exsiccator 11 then, and in described exsiccator 11, gas to be dried is conducted through mixing apparatus 18, then is dried by the absorption and/or the adsorbing medium that absorb moisture from gas.
The gas that is dried then is directed to Consumer's network 20 by export pipeline 19.
To absorb and/or adsorbing medium regeneration in order making, to utilize motor driven at low speed rotor 15 (this is known), therefore absorption and/or adsorbing medium alternately are conducted through arid region 13 and renewing zone 14.
Side pipeline 22 guides to renewing zone 14 with part gas to be dried from compressed-air line 9, and therefore this part gas main pipe 17 of not flowing through is not cooled in aftercooler 24.
Therefore, gas to be dried is still relatively warm and unsaturated, makes it can absorb water from absorption and/or adsorbing medium when flowing through renewing zone 14.
14 the outlet port in the renewing zone, gas is directed to regeneration cooler 35 via cooling tube 33, so that then be inhaled into mixing tube 29 via space 34 with by suction inlet 30, this gas mixes with gas to be dried from main pipe 17 in mixing tube 29.
The method that is used to control the pressurized air unit according to the present invention may further comprise the steps: at least based on systematic parameter control expulsion valve 8,27,37 or 39, the non-systematic parameter on the feeding side of relevant expulsion valve 8,27,37 or 39 of wherein said systematic parameter is to enter storage 40 via described expulsion valve 8,27,37 or 39 with condensation product.
For this reason, controller 41 is furnished with the algorithm that is used for controlling in this way at least one (being all expulsion valves 8,27,37 or 39 in this example).
In this example, the said system parameter comprises the measured value of the system pressure on the feeding side of corresponding expulsion valve 8,27,37 and 39, and described measured value is measured by corresponding pressure transducer 42-45; Yet in this example, the liquid level on expulsion valve 6 and 25 the feeding side also is considered.
Different expulsion valve 8,27,37 and 39 preferably is controlled so as to two expulsion valves 8,27,37 and 39 that have the different pressures value on the feeding side by controller 41 and can not be opened simultaneously.
Yet, can also control different expulsion valve 8,27,37 and 39, make them open simultaneously never, this for example can and judge based on this whether expulsion valve 8,27,37 or 39 is opened and realize by the liquid level on the feeding side of measuring these corresponding expulsion valves 8,27,37 and 39.
In this example, this method is further comprising the steps of, measures the liquid level on the feeding side of expulsion valve 8,27,37 and 39 that is:, and just the expulsion valve 8,27,37 or 39 of being correlated with is opened as long as the liquid level of measuring surpasses preset limit value.
This can realize by above-mentioned controller 41, and for this reason, described controller 41 connects liquid level sensor 46-49, and considers the relevant pressure value measured on the feeding side of expulsion valve 8,27,37 and 39 when this method of application all the time.
According to characteristic of the present invention,, except the discharging condensation product, these expulsion valves 8,27,37 and 39 can also be used for other function, for example venting by by the different expulsion valve 8,27,37 and 39 of central control unit 41 controls.
In the example of given pressurized air unit 1, it can be used to for example make exsiccator regeneration at stopping period, is therefore sent the gas of super-dry equipment 16 to be emitted via expulsion valve 37 and/or 39.
For example, be close to the pressure that the expulsion valve 8 that is located at interstage cooler 5 back (being the downstream) can also be used to bleed off interstage cooler, to empty the volume of interstage cooler.
The method according to this invention also preferably includes following steps, that is: generation alarm when above-mentioned controller 41 records incorrect measured value, because above-mentioned parameter does not change in the mode of controller 41 expectations, and consider the different said system parameter of liquid level on the feeding side with expulsion valve at least, and consider possibly, the liquid level on the feeding side of expulsion valve at least.
The example is: if in expulsion valve 8 or 27 one controlled device 41 when the related fluid surface sensor detects too high liquid level is opened, and the liquid level sensor 46 or 47 on the feeding side of another in expulsion valve 8 or 27 no longer detects liquid, then can infer easily expulsion valve 8 27 or the wiring of liquid level sensor 46 or 47 fail correct the execution.
Advantage according to pressurized air of the present invention unit 1 is: it makes it possible to determine to pass through the volume of expulsion valve 8,27,37 and 39 condensation products of discharging.
The quantity of the condensation product of expecting in the compressor can be calculated according to the humidity, mass flow rate, force value and the temperature that suck air.
These data can be measured or be calculated according to measured value, and therefore the quantity of the condensation product that can discharge with reality together obtains.If the quantity of the condensation product of discharging is less than the quantity of the condensation product that is calculated, then this may show that for example separator work is undesired.
If the volume of the condensation product that is separated is greater than calculated value, then this for example may show have leak of liquid between fluid loop and gas side.
Another advantage that is used for discharging the method for condensation product according to the present invention is: needn't compressor or wherein the pressure of condensation product storage can fall in the unit that is lower than atmospheric pressure safety check is set.This can detect by controller 41, and its middle controller 41 takes in to control relevant expulsion valve it, and making no longer needs safety check in the outlet port of drainage system.
In above-mentioned example, the main systematic parameter that is used to control expulsion valve 8,27,37 and 39 comprises system pressure and liquid level, but according to the present invention, does not get rid of other systematic parameter (such as temperature value) that is used for this purpose, perhaps different parameters is used in combination.
Certainly, do not get rid of the systematic parameter that is used to control expulsion valve of measuring, calculating or determine by other any way.
It also is a kind of selection that the measured value of or several systematic parameters and calculated value are used in combination.
The present invention is confined to describe by way of example and the method and apparatus by description of drawings never in any form; On the contrary, this method according to the present invention can realize by a lot of different modes with the equipment that is used to use this method, still fall within the scope of the invention simultaneously.

Claims (16)

1. one kind is used for the method that control is provided with the pressurized air unit of at least one controlled expulsion valve (8,27,37,39), it is characterized in that,
Described method comprises the step of controlling described expulsion valve (8,27,37,39) at least based on the coefficient parameter of the systematic parameter on the feeding side of non-described expulsion valve (8,27,37,39).
2. the method for claim 1 is characterized in that, described systematic parameter comprises the measured value of system temperature or pressure.
3. the method for claim 1 is characterized in that, described systematic parameter comprises the internal state signal that produces according to measurable physical parameter.
4. the method for claim 1 is characterized in that, described method also comprises the step of the liquid level on the feeding side of measuring described expulsion valve (8,27,37,39).
5. as each described method among the claim 1-4, it is characterized in that described method also comprises a step, it measures corresponding described expulsion valve (8,27,37,39) with different expulsion valves (8,27,37,39) pressure on the feeding side, make two described expulsion valves (8 on the feeding side with different pressures value, 27,37,39) can not be opened simultaneously.
6. as each described method among the claim 1-4, it is characterized in that described method also comprises in the mode that can not open simultaneously forever controls step as two different expulsion valves (8,27,37,39) of the part of pressurized air unit (1).
7. method as claimed in claim 6 is characterized in that, described method comprises liquid level on the feeding side of measuring described corresponding expulsion valve (8,27,37,39) and the step that whether is opened based on described liquid level judgement expulsion valve (8,27,37,39).
8. each described method in the claim as described above is characterized in that described method comprises at least one step of emitting gas and/or reducing pressure of utilizing in the described expulsion valve (8,27,37,39).
9. each described method in the claim as described above is characterized in that: adopted controller (41) in order to control described expulsion valve (8,27,37,39).
10. each described method in the claim as described above is characterized in that, said method comprising the steps of:
Give the alarm when recording incorrect measured value at described controller (41), because described systematic parameter does not change in the desired mode of described controller (41), the described systematic parameter of wherein being measured is carried out consideration.
11. each described method in the claim is characterized in that as described above, described method comprises the step of the amount of determining the condensation product of being discharged by described expulsion valve (8,27,37,39).
12. one kind makes it possible to the pressurized air unit that application rights requires the described method of 1-11, it is characterized in that:
Pressurized air unit (1) is provided with at least one expulsion valve (8 that is connected to controller (41) with controlled manner, 27,37,39), wherein said controller (41) also is connected to detection device to measure non-described expulsion valve (8 at least, the systematic parameter of the systematic parameter on the feeding side 27,37,39), wherein said controller (41) comprises based on the described systematic parameter of being measured controls described expulsion valve (8,27,37,39) algorithm.
13. pressurized air as claimed in claim 12 unit is characterized in that, described detection device comprises at least one pressure transducer (42,43,44,45), and it is located on the feeding side of described expulsion valve (8,27,37,39).
14., it is characterized in that described detection device comprises the pressure transducer (42-45) that is used for each expulsion valve (8,27,37,39) on the feeding side that is located at described expulsion valve as claim 12 or 13 described pressurized air unit.
15., it is characterized in that described detection device also is designed to determine the liquid level on the feeding side of described expulsion valve (8,27,37,39) as each described pressurized air unit among the claim 12-14.
16. as each described pressurized air unit among the claim 12-15, it is characterized in that, described expulsion valve (8,27,37,39) be separator (6,25), the part of exsiccator (11) or cooler (5,24), or at the feeding side and the separator (6 of described expulsion valve, 25), exsiccator (11) or cooler (5,24) link to each other.
CN200980125014.3A 2008-07-02 2009-06-11 A kind of control pressurized air unit method and the pressurized air unit of application the method Active CN102077008B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE2008/0366 2008-07-02
BE2008/0366A BE1018206A3 (en) 2008-07-02 2008-07-02 METHOD FOR CONTROLLING A COMPRESSED AIR PLANT AND COMPRESSED AIR PLANT FOR USING SUCH METHOD.
PCT/BE2009/000031 WO2010000045A1 (en) 2008-07-02 2009-06-11 Method for controlling a compressed air unit and compressed air unit for applying such a method

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CN102077008A true CN102077008A (en) 2011-05-25
CN102077008B CN102077008B (en) 2015-08-05

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EP (1) EP2307785B1 (en)
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KR (1) KR101436197B1 (en)
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AU (1) AU2009266434B2 (en)
BE (1) BE1018206A3 (en)
BR (1) BRPI0914124B1 (en)
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